function Load() {
    // 获取背景图
    this.bg = Tool.getImage('./images/bg.jpg');

    // 获取logo
    this.logo = Tool.getImage('./images/logo.png');

    // 绘制
    this.draw = function() {
        // 绘制logo
        this.logo.onload = function() {
            var width = canvas.width;
            var height = this.width / canvas.width * this.height;
            ctx.drawImage(this, 0, 60, width, height);
        }

        // 绘制背景图
        this.bg.onload = function() {
            ctx.drawImage(this, 0, 0);

            // 绘制圆角矩形边框 - 开始游戏
            Tool.drawRoundedRect(ctx, (canvas.width - 270) / 2, 350, 270, 40, 4, 0, '#FCE99E', '#FCE99E');
            ctx.font = '18px 宋体';
            ctx.textAlign = 'center';
            ctx.textBaseline = 'middle';
            ctx.fillStyle = '#dc8218';
            ctx.fillText('开始游戏', canvas.width / 2, 370);

            // 绘制圆角矩形边框 - 退出
            Tool.drawRoundedRect(ctx, (canvas.width - 270) / 2, 400, 270, 40, 4, 0, '#FCE99E', '#FCE99E');
            ctx.font = '18px 宋体';
            ctx.textAlign = 'center';
            ctx.textBaseline = 'middle';
            ctx.fillStyle = '#dc8218';
            ctx.fillText('退出', canvas.width / 2, 420);
        }
    }
}